I want to fit stop valves to the sink,bath and toilet in my upstairs bathroom. Going to fit a new suite in the summer and would like these in place first.

I have a combi boiler. Would the procedure be ; turn of water from the main inlet, turn off boiler, drain taps in bathroom and fit the valves?

I'm a bit wary of causing an airlock in the system. Once the valves are fitted would i then turn on water, turn on boiler, leave the taps open to let the water flow or would I keep the taps shut to let the water flow through the system befor opening?

Just turn off the water. You can switch the combi off, but it is not necessary. Drain the water as you say to connect the valves. Do not worry, it is not possible to create airlocks in a pressurised system. Any air will be forced out as soon as the water is turned on again and a hot tap opened.

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